Now that the karmic release cycle has opened Ubuntu developers are focusing on merging packages from Debian unstable into karmic repositories. If you’re looking for improving your packaging skills here is a list of merges that look easy:

From the main repository:

virtinst

tomcat6

squid

openvpn

nagios-plugins

hsqldb

apache2

From the universe:

snort

proftpd-dfsg

phpldapadmin

drupal

asterisk

To get started head to Ubuntu Merge-O-Matic and grab one of the package above. The Merging wiki page has more information about the merge process if you get stuck somewhere along the way. Once you’re done with a package seek sponsorship if you don’t have upload privileges and don’t forget to send relevant patches to Debian!